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区块链技术到底是什么鬼,为何被疯炒? - 资讯 - 清泛网 - 专注C/C++及内核技术

...和节点之间相连形成了巨大的网络。 例如:A向周边节点广播:我要转账给B一个比特币。然后A将比特币的信息发给周边节点进行验证,周边节点确认A持有该比特币的合法性。当一定数量的节点验证通过后,交易成立,周边节点...
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浅谈TCP优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...1460,所以「cwnd」的初始值是3MSS。 当我们浏览视频或者下载软件的时候,「cwnd」初始值的影响并不明显,这是因为传输的数据量比较大,时间比较长,相比之下,即便慢启动阶段「cwnd」初始值比较小,也会在相对很短的时间...
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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术

...ockdecho “/sbin/rpc.lockd” >>/etc/rc.local 5安装Heartbeat 5.1 下载安装包 由于实验机器没法上网 从网上下载Heartbeat的安装包并使用Xftp工具上传到share1和2 下载地址: http://zhidao.baidu.com/link?url=_aPuZIb4MrknzzrITdXLToXoTORHa6EtT5-PxJsnZ89Heuzd...
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Linux编译安装软件configure参数(持续更新) - 开源 & Github - 清泛网 - ...

Linux编译安装软件configure参数(持续更新)configure_paramPHP configure参数,Squid configure参数,MySQL configure参数,Postfix configure参数,Courier configure参数,Sasl2 configure参数 等。PHP configure参数: ./configure --prefix=/usr/local/php --with-gd=/usr/lo...
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What is the difference between map and flatMap and a good use case for each?

... as well, i.e., N elements ==> N elements. Using flatMap >>> fm = data.flatMap(lambda line:line.split(" ")); >>> fm.collect() [u'hadoop', u'is', u'fast', u'hive', u'is', u'sql', u'on', u'hdfs', u'spark', u'is', u'superfast', u'spark', u'is', u'awesome'] The output is differe...
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Fragment is not being replaced but put on top of the previous one

... You can clear backStack before replacing fragments: FragmentManager fm = getActivity().getSupportFragmentManager(); for (int i = 0; i < fm.getBackStackEntryCount(); i++) { fm.popBackStack(); } // replace your fragments ...
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How exactly to use Notification.Builder

...ager) getSystemService(Context.NOTIFICATION_SERVICE); manager.notify(FM_NOTIFICATION_ID, builder.build()); } // Remove notification private void removeNotification() { NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); manager...
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Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...性很低,现在国内Android上的Push基本上是各自为政,很多软件都自己实现Push。导致手机被经常性的唤醒,耗电耗流量严重。 市面上已经有很多第三方的公共推送服务,大家可以选择一个适合自己应用的推送服务。腾讯也有信鸽...
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Call an activity method from a fragment

...ivity()).yourPublicMethod(); From activity to fragment: FragmentManager fm = getSupportFragmentManager(); //if you added fragment via layout xml YourFragmentClass fragment = (YourFragmentClass)fm.findFragmentById(R.id.your_fragment_id); fragment.yourPublicMethod(); If you added fragment via co...
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Duplicate ID, tag null, or parent id with another fragment for com.google.android.gms.maps.MapFragme

...) { super.onViewCreated(view, savedInstanceState); FragmentManager fm = getChildFragmentManager(); SupportMapFragment mapFragment = (SupportMapFragment) fm.findFragmentByTag("mapFragment"); if (mapFragment == null) { mapFragment = new SupportMapFragment(); FragmentTra...